spare tire size for C230
 

I really appreciate your advice on this:
I bought a used C230 coupe 2002. The previous owner left the spare tire in the trunk and I tried to fit it into the spare tire compartment by first deflating it and then squeezed it into place to no avail. It seems that the spare tire is of wrong size (too big). On the side wall, it reads "165 15 8PR 89P". Will some xpert out there can tell me if this the correct spare tire for my Benz? Thanks in advance.